Hi Dieter,
On Fri, Apr 17, 2009 at 12:25:17PM +0200, Dieter Spaar wrote:
Another problem is that changing the calibration requires a restart of the BS-11 (at least I only saw any effect when I restarted). Additionally when you query the calibration, you get the "PLL Set Value" and the "PLL Work Value", the "Set Value" seems to be used when starting up and the "Work Value" changes, most certainly locking to an external clock also influences it. I did not find anything in the documentation, actually those settings are not indended for the end user, just the factory.
I would assume that you could just provide an accurate E1 clock to the BS-11, then read the 'work value' and set the 'set value' to the value you have obtained.
At least that would be my solution if I was designing a BTS and had to implement a solution for the calibration...
Might be worth some experimentation.
Regards.